<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <ul>
      <li v-for="item in list" :key="item.id">{{item.num}} <button @click="del(item.id)">删除</button></li>
    </ul>
    <button @click="btn">生成</button>
  </div>
  <script src="./js/vue-2.7.14.js"></script>
  <script>
    new Vue({
      el: '#app',
      data: {
        list: [
          { id: 1, num: 2 },
          { id: 2, num: 4 },
          { id: 3, num: 6 },
        ]
      },
      methods: {
        btn() {
          this.list.push({
            id: +new Date(),
            num: Math.floor(Math.random() * (20 - 0 + 1) + 0)
          })
        },
        del(id) {
          this.list = this.list.filter(item => item.id !== id)
        }
      }
    })
  </script>
</body>

</html>